function setup() {

   // check to see if serial is available:

   if (!navigator.serial) {

    alert("WebSerial is not supported in this browser. Try Chrome or MS Edge.");

  }

}

​

// port chooser button:

let portButton;

// variable for incoming serial data:

let inData = 76;

function setup() {

   // check to see if serial is available:

   if (!navigator.serial) {

    alert("WebSerial is not supported in this browser. Try Chrome or MS Edge.");

  }

  // check for any ports that are available:

  serial.getPorts();

  // if there's no port chosen, choose one:

  serial.on("noport", makePortButton);

  // open whatever port is available:

  serial.on("portavailable", openPort);

  // handle serial errors:

  serial.on("requesterror", portError);

  // handle any incoming serial data:

  serial.on("data", serialEvent);

  serial.on("close", makePortButton)

  // add serial connect/disconnect listeners from WebSerial API:

  navigator.serial.addEventListener("connect", portConnect);

  navigator.serial.addEventListener("disconnect", portDisconnect);

  createCanvas(100, 100);

}

​

// if there's no port selected, 

// make a port select button appear:

function makePortButton() {

  // create and position a port chooser button:

  portButton = createButton('choose port');

  portButton.position(10, 10);

  // give the port button a mousepressed handler:

  portButton.mousePressed(choosePort);

}

// make the port selector window appear:

function choosePort() {

  if (portButton) portButton.show();

  serial.requestPort();

}

// open the selected port, and make the port 

// button invisible:

function openPort() {

  // wait for the serial.open promise to return,

  // then call the initiateSerial function

  serial.open().then(initiateSerial);

  // once the port opens, let the user know:

  function initiateSerial() {

    console.log("port open");

  }

  // hide the port button once a port is chosen:

  if (portButton) portButton.hide();

}

// pop up an alert if there's a port error:

function portError(err) {

  alert("Serial port error: " + err);

}

// read any incoming data as a string

// (assumes a newline at the end of it):

function serialEvent() {

  inData = Number(serial.read());

  console.log(inData);

}

// try to connect if a new serial port 

// gets added (i.e. plugged in via USB):

function portConnect() {

  console.log("port connected");

  serial.getPorts();

}

// if a port is disconnected:

function portDisconnect() {

  serial.close();

  console.log("port disconnected");

}

function closePort() {

  serial.close();

}

​

function serialEvent() {

  inData = Number(serial.read())

  console.log(inData)

}

​

const COLORS = "#ef4444 #f97316 #f59e0b #eab308 #06b6d4 #0ea5e9".split(" ").reverse()

​

function draw() {

  const colorIndex = Math.floor(map(inData, 75, 85, 0, COLORS.length, true))

  background(COLORS[colorIndex])

  fill(255)

  textSize(50)

  text(`${inData}º`, 15, 65)

}

​